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\section{Conclusion}
\label{sec:conclusion}

In this paper we have started by identifying the common foundational
characteristics of the emerging \emph{Model Driven Security} concept by exploring various \mds
definitions in literature. We then proposed the Y-Model as an evaluation schema
for \mds, which incorporates the identified characteristics. 
Then we evaluated various \mds methodologies in the literature and discussed
their capabilities and drawbacks according to the Y-Model paradigm.
Furthermore, we also analyzed the trend of \mds evolution in the last decade and proposed a potential future development
approach of \mds by incorporating heterogeneity. Our Heterogeneous
Model Driven Security proposal is designed to enhance the modeling and security analysis
by being based on fine-grained tailored \textsc{Dsl}s for each specific security concern.
